Jonathan Scott
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According to Spacenews:
My non-expert guess would be that some temperature parameter was exceeded as a result of the longer burn needed for the heavier XL version.NASA said late Sept. 17 that engineers analyzed data from Cygnus and found that the thruster worked as intended during those burns. The engine shut down prematurely on two non-sequential burns when a “conservative safeguard in the software settings” triggered a warning system and shut down the thruster.